Question

How many natural numbers lie between 9² and 10²? Between 11² and 12²​

Answer 1

82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99.

122,123,124,125,126-143

Answer 2

Solution:

/* Number of natural numbers lie between n² and (n+1)² = 2n

*/

Here ,

i) n = 9 , n+1 = 10

Number of natural numbers lie between 9² and 10²

= 2× base of first number

= 2×9

= 18

ii ) Number of natural numbers lie between 11² and 12²

= 2× base of the first number

= 2×11

= 22

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